Hand digit (5)

I think it could be either:

Which length description are you looking for?:

thumb

'hand digit' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for thumb that I've seen before include "First digit" , "The hand's pollex" , "Attempt to obtain a lift" , "Opposable digit" , "Hand digit" .)

I've seen this clue in The Independent and the Evening Standard.

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